The classroom whose door/the door of which/of which the door is broken is on the second floor.
3．考查as/which引导的非限制性定语从句。尤其要重视which，as引导的非限制性定语从句和it，what引导的主语从句的区分。
4．考查定语从句中的主谓一致现象。如：
I, who am your close friend, will try my best to he lp you whenever you are in trouble.
5．考查“介词＋关系代词”引导的定语从句。“介词＋关系代词”引导的定语从句，关系代词指人时用whom，指物时用which，不能用that。关系代词作定语时也可用whose。如：
The teacher in front of whose house stands a tall tree is very patient with his students.
6．考查一些特殊的先行词。如：当situation, point, case, activity，scene及period, festival, occasion等出现时，要注意具体情况具体分析；作主语、宾语和表语时，用关系代词that/which; 作状语时，用关系副词where/when或“介词＋which”，表示在某种特定的情形下。
7．考查定语从句、强调句、时间状语从句等的区别。如：
The news that he had passed the exam pleased him and his family.(同位语从句)
The news (that) he to ld me this morning is not interesting. (定语从句)
It was 1914 when the war broke out.(时间状语从句)
